Fundamentals
Have you found yourself experiencing a persistent, subtle shift in your daily experience? Perhaps a lingering fatigue that no amount of rest seems to resolve, or unexpected changes in your body composition despite consistent efforts. Many individuals report a quiet erosion of their vitality, a feeling that their internal systems are simply not operating with the same precision they once did.
This sense of being slightly out of sync, where mental clarity feels diminished or emotional responses seem amplified, is a deeply personal experience. It often prompts a search for answers, a desire to understand the underlying mechanisms that govern our well-being. This journey into understanding one’s own biological systems is not about chasing fleeting trends; it is about reclaiming the inherent capacity for optimal function and vibrant health.
The body possesses an intricate internal messaging network, a sophisticated communication system that orchestrates nearly every physiological process. This network is the endocrine system, a collection of glands that produce and release chemical messengers known as hormones.
These hormones travel through the bloodstream, acting as signals that direct cells and organs, ensuring that the body maintains a stable internal environment, a state known as homeostasis. When this delicate balance is disrupted, even subtly, the effects can ripple throughout the entire system, manifesting as the very symptoms many individuals experience. Understanding how these chemical signals operate provides a foundation for appreciating the profound impact of lifestyle choices on our internal chemistry.
The Endocrine System an Overview
The endocrine system functions like a highly organized orchestra, with each gland playing a specific instrument to produce a harmonious physiological outcome. Key players include the hypothalamus, the brain’s control center, which sends signals to the pituitary gland, often called the “master gland”.
The pituitary, in turn, releases hormones that regulate other endocrine glands, such as the thyroid, adrenal glands, and gonads. This hierarchical control, often described as an axis, ensures coordinated responses throughout the body. For instance, the Hypothalamic-Pituitary-Gonadal (HPG) axis governs reproductive and sexual functions, while the Hypothalamic-Pituitary-Adrenal (HPA) axis manages the body’s stress response.
Hormones influence a vast array of bodily functions, from growth and development to metabolism, electrolyte balance, and reproduction. Their actions are precise, with each hormone designed to bind to specific receptors on target cells, much like a key fitting into a particular lock.
This specificity ensures that messages are delivered accurately, prompting cells to perform their designated tasks. When hormonal levels are either too high or too low, or when cellular receptors become less responsive, the body’s internal communication can falter, leading to a cascade of effects that compromise overall well-being.
Hormones serve as the body’s internal messengers, orchestrating vital physiological processes to maintain internal stability.
How Lifestyle Choices Shape Hormonal Balance
The concept of hormonal recalibration involves restoring optimal function to these internal messaging systems. This is not solely about external interventions; it begins with recognizing the profound influence of daily lifestyle choices. Our dietary patterns, physical activity levels, sleep quality, and stress management strategies are not merely external factors; they are integral components that directly interact with and shape our endocrine function.
These elements collectively contribute to the environment in which our hormones operate, either supporting their balanced production and action or contributing to their dysregulation.
Consider the impact of nutrition. The foods we consume provide the building blocks for hormone synthesis and influence the sensitivity of cellular receptors. A diet rich in whole, unprocessed foods, healthy fats, and adequate protein supports the body’s capacity to produce and utilize hormones effectively. Conversely, dietary patterns high in refined sugars and unhealthy fats can contribute to inflammation and insulin resistance, which directly interfere with hormonal signaling, particularly affecting sex hormones and growth hormone pathways.
Physical activity also plays a significant role in maintaining hormonal equilibrium. Regular, appropriate exercise can improve insulin sensitivity, support healthy testosterone levels in both men and women, and modulate stress hormones like cortisol. However, excessive or inappropriate exercise can sometimes lead to hormonal imbalances, especially in women, highlighting the importance of a balanced approach. The body’s response to movement is a complex interplay of energy demands and hormonal adjustments, all working to maintain systemic integrity.
The Silent Influence of Sleep and Stress
Sleep quality stands as a fundamental pillar of hormonal health. During sleep, the body performs critical repair and regeneration processes, and many hormones are released in pulsatile patterns that are dependent on healthy sleep cycles. Insufficient or disrupted sleep can disrupt the secretion of growth hormone, cortisol, and hormones that regulate appetite, leading to widespread systemic effects. Prioritizing consistent, restorative sleep is a non-negotiable aspect of supporting endocrine function.
Chronic stress, a pervasive aspect of modern life, exerts a powerful influence on hormonal balance. When the body perceives stress, the HPA axis activates, leading to the release of cortisol. While acute cortisol responses are vital for survival, prolonged elevation of this hormone can disrupt the delicate balance of other endocrine systems, including reproductive hormones and thyroid function.
Managing stress through practices such as mindfulness, meditation, or spending time in nature can help mitigate these adverse effects, allowing the body’s hormonal systems to return to a state of equilibrium.
Daily habits like diet, exercise, sleep, and stress management are not separate from hormonal health; they are foundational determinants of endocrine system function.
The interconnectedness of these lifestyle factors means that addressing one area often creates positive ripple effects across others. For instance, improving sleep can reduce stress, which in turn can positively influence dietary choices and energy levels for physical activity. This holistic perspective recognizes that the body operates as a unified system, where each component influences the others.
Understanding these fundamental connections empowers individuals to make informed choices that support their unique biological needs, paving the way for genuine hormonal recalibration and a return to optimal vitality.
The journey toward hormonal optimization begins with a deep appreciation for the body’s inherent intelligence and its capacity for self-regulation. By providing the right inputs through thoughtful lifestyle choices, we create an environment where our endocrine system can function with precision, allowing us to experience sustained energy, mental clarity, and overall well-being. This initial understanding sets the stage for exploring more targeted clinical protocols, which serve as powerful tools when integrated into a comprehensive, personalized wellness strategy.
Intermediate
Moving beyond the foundational understanding of lifestyle’s impact, we now turn to specific clinical protocols that can aid in hormonal recalibration. These interventions are not standalone solutions; they represent precise tools designed to support the body’s endocrine system when lifestyle adjustments alone are insufficient to restore optimal balance.
The aim is to address specific deficiencies or dysregulations, working in concert with a health-conscious lifestyle to achieve a more complete restoration of physiological function. Understanding the ‘how’ and ‘why’ of these therapies is essential for anyone considering a personalized wellness strategy.
Testosterone Recalibration for Men
For men experiencing symptoms associated with declining testosterone levels, often referred to as hypogonadism or andropause, targeted interventions can provide significant relief and restore vitality. Symptoms such as persistent fatigue, reduced libido, changes in body composition, and diminished cognitive function can profoundly impact daily life. Testosterone replacement therapy (TRT) aims to bring circulating testosterone levels back into a healthy physiological range, thereby alleviating these concerns.
A common protocol involves weekly intramuscular injections of Testosterone Cypionate, typically at a concentration of 200mg/ml. This method provides a steady release of testosterone, helping to maintain stable levels between injections. The precise dosage is individualized, based on clinical symptoms and regular laboratory assessments to ensure therapeutic levels are achieved without exceeding physiological norms.
To support the body’s natural testosterone production and preserve fertility, Gonadorelin is often included in the protocol. This peptide, administered via subcutaneous injections, stimulates the pituitary gland to release luteinizing hormone (LH) and follicle-stimulating hormone (FSH), which are crucial for testicular function and sperm production. This approach helps to mitigate the testicular atrophy that can occur with exogenous testosterone administration alone.
Another important consideration in male hormonal optimization is the management of estrogen levels. Testosterone can convert into estrogen through an enzyme called aromatase. While some estrogen is necessary for male health, excessive levels can lead to undesirable effects such as gynecomastia or fluid retention. Anastrozole, an aromatase inhibitor, is often prescribed as an oral tablet to be taken alongside testosterone injections, helping to block this conversion and maintain a healthy estrogen balance.
In certain situations, particularly when fertility preservation is a primary concern, Enclomiphene may be incorporated. This medication works by stimulating the pituitary to produce more LH and FSH, thereby encouraging the testes to produce more natural testosterone. It represents an alternative or adjunctive strategy to support endogenous hormone production.
Male testosterone optimization protocols combine exogenous testosterone with agents like Gonadorelin and Anastrozole to balance efficacy with physiological support.
Hormonal Balance for Women
Women also experience significant hormonal shifts throughout their lives, particularly during peri-menopause and post-menopause, which can lead to symptoms such as irregular cycles, mood changes, hot flashes, and reduced libido. Tailored hormonal optimization protocols for women aim to restore balance and alleviate these symptoms, supporting overall well-being.
Low-dose testosterone therapy for women can address symptoms like diminished libido, energy, and mood. Testosterone Cypionate is typically administered in very small weekly subcutaneous injections, often 10 ∞ 20 units (0.1 ∞ 0.2ml), to achieve physiological levels appropriate for women. The goal is to replicate the natural testosterone concentrations found in pre-menopausal women, avoiding supraphysiological levels that could lead to androgenic side effects.
Progesterone plays a vital role in female hormonal health, particularly in balancing estrogen and supporting uterine health. Its prescription is carefully considered based on the woman’s menopausal status and individual needs. For pre-menopausal women with irregular cycles, progesterone can help regulate the menstrual cycle. In post-menopausal women, it is often prescribed alongside estrogen to protect the uterine lining.
For some women, pellet therapy offers a long-acting option for testosterone delivery. Small pellets containing testosterone are inserted subcutaneously, providing a consistent release of the hormone over several months. This method can be convenient, reducing the frequency of administration. As with men, Anastrozole may be considered when appropriate to manage estrogen conversion, ensuring a balanced hormonal environment.
Post-TRT and Fertility Support for Men
For men who have discontinued TRT or are actively trying to conceive, a specific protocol is implemented to reactivate and support natural testosterone production and spermatogenesis. This transition protocol is crucial for restoring endogenous hormonal function.
The protocol typically includes Gonadorelin, which stimulates the pituitary to release LH and FSH, thereby signaling the testes to resume their natural function. Tamoxifen and Clomid (clomiphene citrate) are also frequently used. These medications work by blocking estrogen receptors in the hypothalamus and pituitary, which in turn reduces the negative feedback on LH and FSH production, allowing for increased natural testosterone synthesis.
Anastrozole may optionally be included in this phase to manage estrogen levels, particularly if there is a concern about elevated estrogen interfering with the recovery of the HPG axis. This comprehensive approach aims to restore the body’s inherent capacity for hormone production, supporting both overall health and reproductive goals.
Growth Hormone Peptide Therapy
Growth hormone peptide therapy represents another avenue for optimizing physiological function, particularly for active adults and athletes seeking benefits related to anti-aging, muscle gain, fat loss, and improved sleep quality. These peptides work by stimulating the body’s natural production of growth hormone, rather than introducing exogenous growth hormone directly.
Key peptides in this category include ∞
- Sermorelin ∞ A growth hormone-releasing hormone (GHRH) analog that stimulates the pituitary gland to release growth hormone in a pulsatile, physiological manner.
- Ipamorelin / CJC-1295 ∞ These are growth hormone-releasing peptides (GHRPs) that work synergistically with GHRH to amplify growth hormone release. Ipamorelin is known for its selective growth hormone release with minimal impact on cortisol or prolactin, while CJC-1295 is a long-acting GHRH analog.
- Tesamorelin ∞ A synthetic GHRH analog specifically approved for reducing excess abdominal fat in certain conditions, also showing benefits for body composition.
- Hexarelin ∞ Another GHRP that can stimulate growth hormone release, often used for its potential in tissue repair and recovery.
- MK-677 (Ibutamoren) ∞ An orally active growth hormone secretagogue that stimulates growth hormone release by mimicking the action of ghrelin, a natural hormone that promotes appetite and growth hormone secretion.
These peptides offer a way to support the body’s natural growth hormone axis, potentially leading to improvements in body composition, recovery from physical exertion, and overall vitality. The pulsatile release pattern induced by these secretagogues is considered more physiological than direct growth hormone administration, potentially mitigating some side effects.
Peptide therapies, such as growth hormone secretagogues, work by stimulating the body’s intrinsic hormone production, offering a physiological approach to optimization.
Other Targeted Peptides
Beyond growth hormone secretagogues, other specialized peptides address specific aspects of health and well-being ∞
- PT-141 (Bremelanotide) ∞ This peptide is specifically utilized for sexual health. It acts on melanocortin receptors in the central nervous system, particularly the MC4 receptor in the hypothalamus, to stimulate sexual arousal and erectile response. It offers a distinct mechanism of action compared to traditional treatments for sexual dysfunction, working on the brain’s pathways that govern desire.
- Pentadeca Arginate (PDA) ∞ A synthetic peptide derived from BPC-157, PDA is gaining recognition for its role in tissue repair, healing, and inflammation modulation. It supports collagen synthesis, enhances blood flow, and reduces inflammatory markers, making it a valuable tool for recovery from injuries, promoting skin regeneration, and supporting gut health. Its enhanced stability and absorption make it a promising agent in regenerative medicine.
These targeted peptides exemplify the precision available in modern biochemical recalibration. They allow for highly specific interventions that address particular physiological needs, complementing broader hormonal optimization strategies.
The integration of these clinical protocols with a disciplined lifestyle approach forms the cornerstone of comprehensive hormonal recalibration. Each intervention is selected based on individual physiological assessments and clinical symptoms, ensuring a personalized strategy.
The aim is not simply to replace what is missing, but to restore the body’s inherent capacity for balance and self-regulation, thereby allowing individuals to reclaim their full potential for health and vitality. This layered approach, combining foundational lifestyle adjustments with targeted biochemical support, offers a robust pathway toward sustained well-being.
| Agent | Primary Action | Targeted Outcome |
|---|---|---|
| Testosterone Cypionate (Men) | Exogenous testosterone replacement | Increased energy, libido, muscle mass, bone density |
| Gonadorelin | Stimulates LH and FSH release | Preservation of natural testosterone production, fertility |
| Anastrozole | Aromatase inhibition | Estrogen level management, reduction of side effects |
| Testosterone Cypionate (Women) | Low-dose exogenous testosterone | Improved libido, energy, mood, bone density |
| Progesterone | Hormone replacement | Menstrual cycle regulation, uterine lining protection |
| Sermorelin | GHRH analog | Stimulates pulsatile growth hormone release |
| PT-141 | Melanocortin receptor agonist | Central nervous system mediated sexual arousal |
| Pentadeca Arginate | Tissue repair, anti-inflammatory | Accelerated healing, reduced inflammation, gut health support |
Academic
A deeper exploration into how lifestyle factors influence hormonal recalibration outcomes requires a systems-biology perspective, moving beyond isolated hormones to consider the intricate interplay of biological axes, metabolic pathways, and cellular signaling. The human body functions as a highly integrated network, where seemingly disparate systems are, in fact, in constant communication. Understanding these complex interactions provides a more complete picture of hormonal health and the mechanisms by which lifestyle interventions exert their profound effects.
The Hypothalamic-Pituitary-Gonadal Axis and Its Regulation
The Hypothalamic-Pituitary-Gonadal (HPG) axis stands as a central regulatory pathway for reproductive and metabolic health in both sexes. This axis operates through a sophisticated feedback loop. The hypothalamus releases gonadotropin-releasing hormone (GnRH) in a pulsatile manner. GnRH then stimulates the anterior pituitary to secrete luteinizing hormone (LH) and follicle-stimulating hormone (FSH).
These gonadotropins, in turn, act on the gonads ∞ the testes in men and ovaries in women ∞ to stimulate the production of sex hormones, primarily testosterone, estrogen, and progesterone, along with gamete maturation.
The sex hormones produced by the gonads then exert negative feedback on both the hypothalamus and the pituitary, regulating their own production. This precise feedback mechanism ensures that hormone levels remain within a narrow physiological range. Disruptions to any component of this axis, whether at the hypothalamic, pituitary, or gonadal level, can lead to widespread hormonal imbalances.
For instance, chronic stress can suppress GnRH release, thereby dampening the entire HPG axis, a phenomenon observed in conditions like functional hypothalamic amenorrhea in women or stress-induced hypogonadism in men.
Interplay with Metabolic Pathways
The HPG axis does not operate in isolation; it is deeply intertwined with metabolic function. Hormones like insulin, leptin, and adiponectin, which are central to energy metabolism, directly influence GnRH secretion and gonadal function. For example, insulin resistance and obesity can alter sex hormone-binding globulin (SHBG) levels, leading to changes in free testosterone and estrogen availability.
In men, obesity is frequently associated with lower total testosterone due to increased aromatization of testosterone to estrogen in adipose tissue. In women, both obesity and significant underweight can disrupt menstrual regularity and ovarian function by altering the delicate hormonal milieu.
The bidirectional communication between metabolic and reproductive systems highlights why lifestyle factors are so impactful. Dietary patterns that promote insulin sensitivity and healthy body composition directly support optimal HPG axis function. Regular physical activity can improve glucose metabolism and reduce systemic inflammation, thereby creating a more favorable environment for hormonal signaling. Conversely, sedentary lifestyles and diets high in refined carbohydrates can perpetuate a cycle of metabolic dysfunction and hormonal imbalance.
The HPG axis, a core hormonal regulator, is intricately linked with metabolic health, demonstrating how energy balance directly influences reproductive function.
Neuroendocrine Regulation and Stress Adaptation
The HPG axis is also profoundly influenced by the Hypothalamic-Pituitary-Adrenal (HPA) axis, the body’s primary stress response system. Chronic activation of the HPA axis, leading to sustained elevation of cortisol, can directly suppress GnRH and LH secretion, thereby inhibiting the HPG axis. This phenomenon, often termed “cortisol steal” or “pregnenolone steal,” describes how the body prioritizes stress hormone production over sex hormone synthesis under conditions of prolonged stress.
Beyond direct suppression, chronic stress can alter neurotransmitter function, affecting the central regulation of hormone release. Neurotransmitters like dopamine, serotonin, and gamma-aminobutyric acid (GABA) play critical roles in modulating hypothalamic and pituitary activity. For example, dopamine agonists, such as PT-141, directly influence sexual arousal by acting on melanocortin receptors in the hypothalamus, demonstrating the direct link between neurochemistry and hormonal responses.
The impact of sleep on hormonal recalibration cannot be overstated. Growth hormone, for instance, is primarily released in pulsatile bursts during deep sleep stages. Chronic sleep deprivation disrupts this natural rhythm, leading to reduced growth hormone secretion and altered metabolic profiles, including impaired glucose tolerance and increased appetite-regulating hormones like ghrelin and leptin. This disruption underscores the importance of restorative sleep as a fundamental intervention for supporting both growth hormone and metabolic health.
Cellular Signaling and Receptor Sensitivity
At the cellular level, the effectiveness of hormonal signaling depends not only on the circulating levels of hormones but also on the sensitivity and number of their specific receptors. Chronic inflammation, oxidative stress, and nutrient deficiencies can all contribute to receptor desensitization, meaning that even adequate hormone levels may not elicit a proper cellular response. For example, insulin resistance is a classic example of receptor desensitization, where cells become less responsive to insulin’s signals, leading to elevated blood glucose.
Lifestyle interventions directly influence cellular receptor sensitivity. A diet rich in antioxidants and anti-inflammatory compounds can protect receptors from damage and maintain their responsiveness. Regular exercise can upregulate receptor expression and improve cellular uptake of hormones. Similarly, stress reduction techniques can mitigate the negative effects of cortisol on receptor function, allowing other hormonal systems to operate more effectively.
Peptide therapies, such as growth hormone secretagogues like Sermorelin or Ipamorelin, work by stimulating the pituitary’s natural release of growth hormone, thereby preserving the physiological feedback mechanisms that regulate its production. This approach contrasts with exogenous growth hormone administration, which can suppress the body’s own production. The nuanced action of these peptides respects the body’s inherent regulatory intelligence, aiming to restore rather than override natural processes.
Pentadeca Arginate, a synthetic form of BPC-157, offers another example of targeted cellular support. Its actions in promoting tissue repair and reducing inflammation are mediated through mechanisms that involve improved angiogenesis and collagen synthesis, which are fundamental cellular processes. By supporting the cellular environment, PDA indirectly contributes to overall systemic health, creating a more conducive setting for hormonal balance.
The journey of hormonal recalibration is a testament to the body’s remarkable capacity for adaptation and self-correction when provided with the appropriate support. It requires a deep appreciation for the interconnectedness of our biological systems and a commitment to a holistic approach that integrates precise clinical interventions with foundational lifestyle practices. This comprehensive understanding empowers individuals to move beyond symptomatic relief, addressing the root causes of imbalance and paving the way for sustained vitality and optimal function.
How Do Circadian Rhythms Affect Hormonal Balance?
| Lifestyle Factor | Primary Hormonal Axis/System Affected | Mechanism of Influence |
|---|---|---|
| Nutrition | HPG Axis, Insulin, Leptin | Provides building blocks for hormones; influences insulin sensitivity and inflammatory markers. |
| Physical Activity | HPG Axis, Cortisol, Growth Hormone, Insulin | Modulates hormone production, improves receptor sensitivity, affects stress response. |
| Sleep Quality | Growth Hormone, Cortisol, Ghrelin, Leptin | Regulates pulsatile hormone release; impacts metabolic and stress hormones. |
| Stress Management | HPA Axis, HPG Axis, Neurotransmitters | Mitigates cortisol’s suppressive effects; influences central nervous system regulation of hormones. |
| Environmental Exposures | Endocrine Disrupting Chemicals (EDCs) | Interferes with hormone synthesis, metabolism, and receptor binding. |
What Are The Long-Term Outcomes of Hormonal Optimization?
The integration of these insights forms the basis of a truly personalized wellness strategy. It acknowledges that each individual’s biological system is unique, responding to lifestyle inputs and clinical interventions in a distinct manner. By continuously assessing and adjusting protocols based on objective data and subjective experience, a path toward sustained hormonal balance can be forged.
This approach is not about quick fixes; it is about cultivating a deep, enduring relationship with one’s own physiology, leading to a profound and lasting restoration of health.
Can Genetic Predispositions Alter Hormonal Recalibration Responses?
References
- Melmed, S. Auchus, R. J. Goldfine, A. B. Koenig, R. J. & Rosen, C. J. (2020). Williams Textbook of Endocrinology. Elsevier.
- Chrousos, G. P. (2009). Stress and disorders of the stress system. Nature Reviews Endocrinology, 5(7), 374-381.
- Fabbri, E. An, Y. Gonzalez-Freire, M. et al. (2016). Bioavailable testosterone linearly declines over a wide age spectrum in men and women from the Baltimore Longitudinal Study of Aging. Journals of Gerontology Series A ∞ Biomedical Sciences and Medical Sciences, 71(5), 549-555.
- BodyLogicMD Medical Review Board. (2024). Lifestyle Factors and Hormone Levels. BodyLogicMD.
- Pfaus, J. G. & Saper, C. B. (2000). The neurobiology of sexual behavior. Journal of Clinical Endocrinology & Metabolism, 85(1), 24-30.
- Ishida, J. Saitoh, M. Ebner, N. Springer, J. Anker, S. D. & von Haehling, S. (2020). Growth hormone secretagogues ∞ history, mechanism of action, and clinical development. JCSM Rapid Communications, 3(1), 25-37.
- Davis, S. R. Wahlin-Jacobsen, S. & International Menopause Society. (2020). Global Consensus Position Statement on the Use of Testosterone Therapy for Women. Climacteric, 23(2), 112-125.
- Bhasin, S. & Jasuja, R. (2018). Testosterone Therapy in Men With Hypogonadism ∞ An Endocrine Society Clinical Practice Guideline. Journal of Clinical Endocrinology & Metabolism, 103(5), 1715-1744.
- Palatin Technologies. (2024). PT-141 (Bremelanotide) for Men ∞ A New Drug to Treat Erectile Dysfunction and Low Libido.
- Frangos, J. (2025). Pentadeca Arginate vs BPC-157 ∞ Understanding the Differences. Amazing Meds.
Reflection
As you consider the intricate dance of hormones and the profound influence of lifestyle, reflect on your own biological systems. This knowledge is not merely information; it is a lens through which to view your personal health journey. Each symptom, each shift in vitality, serves as a signal from your body, inviting a deeper inquiry. Understanding the interconnectedness of your endocrine system, metabolic function, and daily habits provides a powerful framework for proactive health management.
The path to reclaiming vitality is a continuous process of learning and adaptation. It involves listening to your body’s unique responses, interpreting its signals, and making informed choices that align with your physiological needs. This journey is highly individualized, requiring patience and a willingness to explore what truly supports your well-being.
Consider this exploration of hormonal recalibration a starting point, a foundation upon which to build a personalized strategy for sustained health and optimal function. Your body possesses an inherent capacity for balance; the goal is to provide the precise support it requires to express that capacity fully.
Glossary
body composition
optimal function
endocrine system
lifestyle choices
homeostasis
hormonal recalibration
physical activity
growth hormone
hormonal health
sleep quality
hormonal balance
hpa axis
lifestyle factors
personalized wellness strategy
hormonal optimization
personalized wellness
testosterone replacement therapy
testosterone cypionate
natural testosterone production
exogenous testosterone
anastrozole
hormone production
testosterone therapy for women
gonadorelin
hpg axis
growth hormone peptide therapy
sermorelin
growth hormone release
ghrh analog
tissue repair
growth hormone secretagogues
central nervous system
pt-141
pentadeca arginate
metabolic function
